WO2006098382A1 - Methode de coulage et appareil de coulage - Google Patents

Methode de coulage et appareil de coulage Download PDF

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Publication number
WO2006098382A1
WO2006098382A1 PCT/JP2006/305162 JP2006305162W WO2006098382A1 WO 2006098382 A1 WO2006098382 A1 WO 2006098382A1 JP 2006305162 W JP2006305162 W JP 2006305162W WO 2006098382 A1 WO2006098382 A1 WO 2006098382A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotation
forging
mold
molten metal
saddle
Prior art date
Application number
PCT/JP2006/305162
Other languages
English (en)
Japanese (ja)
Inventor
Yuuichi Ienaga
Tadayoshi Tsukeda
Hitohisa Yamada
Masahiko Muro
Yasuhiro Aoki
Original Assignee
The Japan Steel Works, Ltd.
Honda Motor Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Japan Steel Works, Ltd., Honda Motor Co., Ltd. filed Critical The Japan Steel Works, Ltd.
Priority to EP06729183A priority Critical patent/EP1859879B1/fr
Priority to DE602006014101T priority patent/DE602006014101D1/de
Publication of WO2006098382A1 publication Critical patent/WO2006098382A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/08—Shaking, vibrating, or turning of moulds

Definitions

  • the present invention relates to a forging method and a forging apparatus suitable for producing an alloy that easily segregates during solidification.
  • Patent Documents 1 and 2 methods for reducing segregation during fabrication by indirectly reducing segregation by reducing segregation during fabrication or by refining the structure have been proposed (for example, Patent Documents 1 and 2).
  • Patent Document 1 solidifies in a horizontal direction in a directional solidification furnace having a cooling plate and a heating furnace, and slowly rotates around a horizontal axis, while taking a sufficient temperature gradient.
  • This is a forging method that reduces forging defects such as shrinkage and segregation.
  • the method disclosed in Patent Document 2 is a method in which a saddle shape is placed on a chill plate (water-cooled plate) and the saddle shape is rotated in small increments for the purpose of producing a fine equiaxed crystal structure. It is a forging method that repeats and stops and adds horizontal vibration.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2000-343204
  • Patent Document 2 JP 2002-331354 A Disclosure of the invention
  • Patent Document 1 can be produced without forging defects such as shrinkage nests only when a high temperature gradient is applied using an expensive device using a cooling plate and a heating furnace. This method is difficult to apply to a general low cost light alloy forging method. In addition, it is a method that rotates very slowly so as not to break the directionally solidified structure and single crystal structure. This method is effective only when the solidification rate of solidification while heating the mold is very slow. The effect will not be obtained.
  • the forging method disclosed in Patent Document 2 is a method of maintaining soundness using a chill plate and a heating furnace in the same way as Patent Document 1 in order to eliminate microporosity, and it takes a long time to complete solidification. Since this device is occupied, the cost increases. In addition, when such a temperature gradient is increased up and down, although there is a fine effect, there is a very high possibility that component vertical prayers will occur. In addition to these methods, a method of achieving homogeneity by stirring the molten metal using an electromagnetic stirrer has been proposed, but there is a problem that the equipment investment is enormous and the manufacturing cost is high.
  • the present invention is a forged product excellent in quality by giving sufficient stirring power to the molten metal without incurring costs such as the above-mentioned equipment ::!: Number, etc., thereby preventing segregation. It is an object to provide a forging method and a forging device that make it possible to obtain the above. Another object of the present invention is to prevent the coarsening of the crystal structure. In particular, it is an object of the present invention to provide a forging method and a forging apparatus that are most suitable for manufacturing ingots for plastic working (for extruding and forging and rolling) that are thick-walled products that are prone to partial prayer.
  • the vertical mold containing the molten metal is rotated in a predetermined direction for a predetermined time with the vertical axis as a rotation axis while solidifying the molten metal, and reaches the predetermined time. Then, the mold is rotated in a direction opposite to the direction of rotation for a predetermined time, and the forward and reverse rotation is repeated to solidify the molten metal.
  • the forging method of the present invention is characterized in that the inner surface shape of the vertical feeder is a non-rotating body shape.
  • a stirring force is applied to the molten metal inside. It is characterized in that a stirring portion to which the shape to be given is provided is provided.
  • the forging method of the present invention is characterized in that the inner surface shape of the saddle-shaped forging portion is a rotating body shape.
  • the forging method of the present invention is characterized in that the rotation of the saddle type is such that the peripheral speed of the outermost metal melt is 400 to lOOOOmmZ seconds, and the rotation time in one direction is 5 to 60 seconds. To do.
  • the forward and reverse rotations of the bowl are started in the range of the solidification start temperature of the molten metal to the solidification start temperature + 200 ° C or less until the solid is completely solidified. It is characterized by being continued.
  • the forging device of the present invention includes a saddle mold for containing and solidifying a molten metal, a rotating device capable of rotating the saddle mold in a forward and reverse direction with a vertical axis as a rotation axis, and the saddle mold. Is rotated continuously in a predetermined direction at a predetermined rotational speed for a predetermined time, and after reaching the predetermined time, it is rotated so as to repeat a continuous rotation at a predetermined rotational speed for a predetermined time in a direction opposite to the rotational direction. And a rotation control unit that controls the apparatus.
  • the forging device of the present invention is provided with an agitation unit provided with an inner surface of the slag type hot water supply unit and having a shape that imparts a stirring force to the molten metal inside as the slab shape rotates. It is characterized by that.
  • the forging device of the present invention is characterized in that the stirring unit is a protrusion formed on the inner surface of the feeder unit along the vertical direction.
  • the forging device of the present invention is characterized in that the protrusion has an upper end height protruding above the gate.
  • the forging device of the present invention is characterized in that the protrusions are provided in the number of 1 to 4 at intervals in the circumferential direction.
  • the molten metal in the vertical mold is oscillated without wavering the molten metal surface. Stirring is performed.
  • the temperature distribution of the molten metal in the mold is made uniform, and the temperature of the molten metal is uniform except for the vicinity of the mold wall where the influence of cooling by the mold is large.
  • the liquid phase is maintained as a whole. Solidification does not start immediately after pouring, but the temperature of the liquid phase that has been stirred decreases, and solidification does not proceed until the solidification start temperature is reached.
  • the above-described action is usually more effective for a forged product having a longer solidification time and a larger volume.
  • a stirring portion provided with a shape capable of stirring the molten metal on the inner surface of the feeder portion.
  • the stirring portion can be constituted by a protruding portion, a protrusion, a stirring plate, or the like as long as it can give a stirring effect to the molten metal. More effectively, it is effective to provide a protrusion along the vertical direction in the feeder part. It is desirable that the ridge protrudes about 10 to 25 mm from the liquid phase part of the gate after pouring.
  • the protrusions are not limited to the vertical direction as long as they are along the vertical direction, and may be provided to be inclined with respect to the vertical direction.
  • the inner surface of the feeder part has a non-rotating body shape such as a polygon, turbulence is likely to occur inside the feeder part when the saddle mold rotates, and stirring Increases effectiveness.
  • the inner surface has a rotating body shape in the forging part because it needs to flow as a whole.
  • the peripheral speed of the outermost periphery of the molten metal is in the range of 400 to 1000 mmZ seconds, and the switching interval between forward and reverse rotations is 5 to 60 seconds. This is because if the peripheral speed is less than 300 mmZ seconds, the effect of cooling is great! A sufficient stirring effect cannot be given to the molten metal near the vertical wall, while a peripheral speed exceeding 1500 mmZ seconds is given. In addition, since the stirring action is too strong and the liquid phase surface undulates, there is a problem such as a hot water boundary and gas entrainment, it is desirable to rotate the saddle so that the speed is within the above range.
  • the vertical rotation starts at a temperature range between the solidification start temperature and the solidification start temperature + 200 ° C or less and continues until the solidification end temperature is reached.
  • the vertical rotation action is to make the composition and temperature distribution uniform by stirring the liquid phase part, so it must be performed immediately before the start of solidification and until the end of solidification when the liquid phase disappears. It is desirable to continue. If possible, it is desirable that the rotation starts from the time of filling until the forged part reaches the solidification start temperature at least. Regarding the end of rotation, if the vertical rotation is completed at a temperature higher than the solidification end temperature, the temperature distribution of the molten metal in the unsolidified part becomes non-uniform thereafter, which tends to cause partial prayer. It is desirable to continue the vertical rotation until the temperature becomes lower.
  • the switching between the saddle-shaped rotation and the forward / reverse rotation can be performed by a rotation control unit that controls a rotating device including a motor or the like.
  • the rotation control unit can be composed of a control circuit, a CPU that is operated by a program, and the like.
  • the present invention is suitable for forging alloys that are susceptible to segregation during solidification by weight segregation, and are particularly applicable to Mg alloys containing zinc, rare earth metals, and other light alloys. . Especially for thick walled products or billets and ingots for extrusion, rolling and forging Suitable.
  • the present invention is not limited to specific metal materials, but can be applied to various metal materials that are advantageous by suppressing prayers and making structures finer.
  • the vertical mold containing the molten metal is rotated in a certain direction for a predetermined time with the vertical axis as the rotation axis while solidifying the molten metal.
  • the saddle mold is rotated in a direction opposite to the direction of rotation for a predetermined time, and the forward and reverse rotation is repeated to solidify the molten metal, so that there is as little segregation as possible.
  • a fine homogeneous structure can be obtained, and a metal material having excellent ductility and strength can be obtained.
  • a mold for containing and solidifying a molten metal a rotating apparatus capable of rotating the mold in the forward and reverse directions with the vertical axis as a rotation axis, The operation of continuously rotating the saddle mold in a predetermined direction for a predetermined time at a predetermined rotation speed and continuously rotating for a predetermined time at a predetermined rotation speed in a direction opposite to the rotation direction after reaching the predetermined time is repeated.
  • the rotation control unit that controls the rotation device is provided, so that the above-described operation can be reliably obtained by controlling the rotation of the saddle type.
  • FIG. 1 is a schematic view showing a forging device according to an embodiment of the present invention.
  • FIG. 2 It is the schematic which shows the example of a change similarly.
  • FIG. 3 is a schematic view showing a test apparatus used in an example of the present invention.
  • FIG. 4 It is the schematic which shows the example of a change similarly.
  • FIG. 5 is a graph showing the relationship between the number of the same ribs and the subsidence depth.
  • FIG. 6 is a graph showing the relationship between the number of the same ribs and the amount of sedimentation.
  • FIG. 7 is a diagram showing the distribution of chemical components of the forged material when the rotational state of the saddle is changed in the same invention example.
  • FIG. 8 is a view showing the distribution of chemical components in the vertical and radial directions of the forged material when the vertical rotation state is changed in the same invention example.
  • FIG. 10 is a structure observation photograph of a forged product of the same invention example.
  • FIG. 11 is a structure observation photograph of the same conventional forged product.
  • FIG. 12 is a schematic diagram of a structure observation photograph of a forged product of the same invention example and conventional example. Explanation of symbols
  • FIG. 1 (a) is a schematic view showing the forging apparatus of the present invention
  • FIG. 1 (b) is a view of the mold 1 of the forging apparatus as viewed from the upper surface.
  • the cylindrical saddle 1 has a feeder part 2 made of a box (square tube) with a large inner size at the top, and a carbon plate 3 is attached to the inner surface of the feeder part 2 to prevent shrinkage. It has been.
  • the saddle mold 1 is installed on a rotating device 6 covered with a heat insulating material or a water-cooled structural member (not shown), and the saddle mold 1 can be rotated by the rotating device 6.
  • the rotating device 6 includes a turntable 60 on which the vertical mold 1 is installed.
  • the turntable 60 is not shown in the figure!
  • a motor 61 is attached via a gear, and the turntable 60 is provided by the motor 61. Is driven to rotate.
  • the motor 61 is capable of adjusting the rotation speed and switching the rotation direction.
  • the rotation device 6 is connected to a rotation control unit 7 including a CPU 70 and a drive circuit 71. Further, the rotation control unit 7 has a vertical rotation speed and a reverse rotation switching interval. A setting unit 72 for setting is provided. The rotation control unit 7 has a rotation speed of 0 to: LOOrpm, The switching interval can be suitably set from 1 to 300 seconds.
  • the rotation setting unit may be set to input an appropriate value by an operator's operation. In addition, the rotation setting unit may store necessary data in a storage unit such as a nonvolatile memory or an HDD in advance. It may be configured to read out.
  • Mg alloy or the like is melted in a melting furnace 10 such as a crucible, and the molten metal 11 is poured into the mold 1 through the tundish 12.
  • the molten metal 11 is accommodated up to a predetermined height of the hot metal part 2.
  • a control command is given from the CPU 70 to the drive circuit 71 based on the rotation speed and rotation switching interval set in advance by the setting unit 72, and a control signal is given to the rotating device 6. Thereby, the rotating device 6 rotates the mold 1 in accordance with the control command.
  • the peripheral speed of the outermost circumference of the molten metal is 00 ⁇ : LOOOm mZ seconds, and the stirring temperature is given to achieve uniform temperature of the molten metal.
  • An appropriate turbulent flow is generated in the feeder 2 to enhance the stirring action.
  • the undulation of the liquid surface is suppressed by an appropriate rotation speed.
  • the rotation direction is switched at an optimal switching interval (5 to 60 seconds) immediately before the rotation of the metal mold 11 is made steady by the rotation of the vertical mold 1, and the molten metal 11 is effectively stirred.
  • an optimal switching interval (5 to 60 seconds) immediately before the rotation of the metal mold 11 is made steady by the rotation of the vertical mold 1, and the molten metal 11 is effectively stirred.
  • FIG. 2 (a) is a schematic view showing such a forging apparatus
  • FIG. 2 (b) is a view of the mold 1 of the forging apparatus as viewed from the upper surface.
  • the stirring portion 8 is formed as a protrusion (rib) extending in the longitudinal direction. Further, as shown in FIG.
  • the upper end position of the stirring unit 8 protrudes above the liquid surface when the molten metal is accommodated in a bowl shape, preferably in the circumferential direction. Install 1 to 4 sheets at an angular interval.
  • the present invention is not limited to a specific number.
  • the Mg—Zn—RE alloy was forged using the forging apparatus of the above embodiment.
  • the component of the stationary material (marked with X) exceeds the plus side, and there are several points. It can be seen that various component values are obtained. Even if you look at the width of the glaze, ordinary stationary forged materials that do not rotate are shaking greatly, but those that are solidified by rotating agitation are stable with little fluctuation.
  • the difference in the component values in the radial direction between the central portion and the surface was also confirmed in the rotary stirrer and the stationary forged material. They are shown in Figs.
  • the component values of the rotating stirrer in Fig. 8 are within the target range in both the vertical and radial directions of the manufactured product.
  • the stationary forged material in Fig. 9 concentrates from the bottom of the forged product to the upper side where solidification is slow, and in the radial direction where the solidification is slow for La, Zn, and Y, and deviates from the target component. That is, the effect of the present invention by stirring is clear.
  • FIG. 12 is a schematic diagram of a micrograph of the comparative example of the manufactured product shown in FIG. 11, and FIG. 12 (b) is a micrograph of the manufactured example of the manufactured product shown in FIG. It is a schematic diagram of a mirror photograph.
  • the mold containing the molten metal is rotated in a predetermined direction for a predetermined time with the vertical axis as a rotation axis while solidifying the molten metal, and after reaching the predetermined time, Is rotated in a direction opposite to the rotation direction for a predetermined time, and the forward and reverse rotation is repeated to solidify the molten metal, so that the amount of partial precipitates is reduced as much as possible, and a fine homogeneous structure is obtained.
  • An excellent metal material can be obtained.
  • the forging device of the present invention includes a saddle mold for containing and solidifying a molten metal, a rotating device capable of rotating the saddle mold in a forward and reverse direction with a vertical axis as a rotation axis, and the saddle mold as a predetermined mold.
  • the rotation device is continuously rotated in a certain direction at a rotation speed for a predetermined time, and after the predetermined time has been reached, the rotation device is controlled to repeat an operation for continuous rotation at a predetermined rotation speed in a direction opposite to the rotation direction for a predetermined time. Therefore, the above-described operation can be reliably obtained by controlling the saddle type rotation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Forging (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

L’invention concerne la prévention de la ségrégation au cours du coulage, par ex. un alliage de magnésium qui contient des éléments ajoutés ou similaire possédant une différence importante de gravité spécifique afin d'obtenir un coulage de qualité satisfaisante. Un moule (1) qui contient un métal fondu est mis en rotation selon une certaine direction sur son axe vertical considéré comme axe de rotation avec un rotateur (7) et pendant une durée donnée alors que le métal fondu est en cours de solidification. Une fois la durée donnée écoulée, le moule (1) est mis en rotation pendant une durée donnée selon la direction opposée à la première direction de rotation. La rotation normale/inverse est répétée jusqu’à solidification du métal fondu. Ainsi, le métal fondu oscille et est remué sans plisser la surface du métal fondu, la température du mélange dans le moule ayant ainsi une répartition homogène. La production de précipités par ségrégation est minimisée et la texture obtenue est fine et homogène. Ainsi, le matériau métallique obtenu est excellent du point de vue de sa ductilité et de sa résistance.
PCT/JP2006/305162 2005-03-15 2006-03-15 Methode de coulage et appareil de coulage WO2006098382A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06729183A EP1859879B1 (fr) 2005-03-15 2006-03-15 Methode de coulage et appareil de coulage
DE602006014101T DE602006014101D1 (de) 2005-03-15 2006-03-15 Verfahren zum giessen und giessvorrichtung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-072732 2005-03-15
JP2005072732A JP4314207B2 (ja) 2005-03-15 2005-03-15 鋳造方法および鋳造装置

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WO2006098382A1 true WO2006098382A1 (fr) 2006-09-21

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EP (1) EP1859879B1 (fr)
JP (1) JP4314207B2 (fr)
DE (1) DE602006014101D1 (fr)
WO (1) WO2006098382A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102554174A (zh) * 2011-12-26 2012-07-11 青岛正大铸造有限公司 一种减少离心铸造比重偏析的方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4296158B2 (ja) * 2005-03-15 2009-07-15 株式会社日本製鋼所 Ｍｇ合金の製造方法
CN108311654B (zh) * 2018-02-09 2020-06-16 邢台德龙机械轧辊有限公司 采用离心方法制备厚壁金属模具的生产方法

Citations (5)

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Publication number Priority date Publication date Assignee Title
US2116367A (en) 1935-10-17 1938-05-03 Submarine Signal Co Apparatus for treating metals
GB1472288A (en) 1974-05-01 1977-05-04 Tuchkevich N Method of producing metal ingots
JPS55126345A (en) 1979-03-23 1980-09-30 Kawasaki Steel Corp Casting method of large-size killed steel ingot of superior internal characteristic and less center segregation
EP0293961A1 (fr) 1987-05-30 1988-12-07 Ae Plc Procédé et dispositif pour la coulée
JP2002331352A (ja) 2001-05-09 2002-11-19 Mitsubishi Materials Corp タービンブレードの製造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6263951B1 (en) * 1999-04-28 2001-07-24 Howmet Research Corporation Horizontal rotating directional solidification
JP2002331354A (ja) * 2001-05-09 2002-11-19 Mitsubishi Materials Corp 微細な等軸晶組織を有する鋳造体の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2116367A (en) 1935-10-17 1938-05-03 Submarine Signal Co Apparatus for treating metals
GB1472288A (en) 1974-05-01 1977-05-04 Tuchkevich N Method of producing metal ingots
JPS55126345A (en) 1979-03-23 1980-09-30 Kawasaki Steel Corp Casting method of large-size killed steel ingot of superior internal characteristic and less center segregation
EP0293961A1 (fr) 1987-05-30 1988-12-07 Ae Plc Procédé et dispositif pour la coulée
JP2002331352A (ja) 2001-05-09 2002-11-19 Mitsubishi Materials Corp タービンブレードの製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1859879A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102554174A (zh) * 2011-12-26 2012-07-11 青岛正大铸造有限公司 一种减少离心铸造比重偏析的方法

Also Published As

Publication number Publication date
JP4314207B2 (ja) 2009-08-12
JP2006255716A (ja) 2006-09-28
EP1859879A4 (fr) 2009-03-04
DE602006014101D1 (de) 2010-06-17
EP1859879A1 (fr) 2007-11-28
EP1859879B1 (fr) 2010-05-05

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